What I notice about the 1/2 ton towables jargon is that usually they're towable in dry mode. The 1/2 ton towables have weights that are 1/2 ton truck doable when not loaded. Like 1300-1600lb pin weights. That weight falls directly under or at the payload capacities of most 1/2 tons. Problem is when you load em up they weigh more. That means most 1/2 tons are overloaded when towing 5th wheels.
You can get 1/2 tons that have high payload capacities if you order one. The ones on the dealers lots are under rated.
The other side to lite 1/2 ton towables is they're lite for a reason. That's because they don't use heavier materials and components. Lighter axles, thinner frames, less bulk in cabinets, etc. They won't stand up to the same usage as reg 5th wheels.
